<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model="selectAll" />
    </label>
    <span> <span>已完成{{quantityCompleted}}</span> / 全部{{ todoList.length }} </span>
    <button class="btn btn-danger" @click="deleteBtnHandle">清除已完成任务</button>
  </div>
</template>

<script>
export default {
  name: "Footer",
  props: ["todoList", "selectAllOrNo", "deleteIsComplete"],
  computed: {
    selectAll: {
      get() {
        return this.todoList.every((item) => item.done) && this.todoList.length;
      },
      set(value) {
        this.selectAllOrNo(value);
      },
    },
    quantityCompleted() {
      return this.todoList.reduce((p, c) => (c.done ? p + 1 : p), 0);
    },
  },
  methods: {
    deleteBtnHandle() {
      this.deleteIsComplete()
    }
  }
};
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>